From 52a6f60cea22282e87e5f0f57daabcd6332b0feb Mon Sep 17 00:00:00 2001
From: "Thomas A. Christensen II" <25492070+MillironX@users.noreply.github.com>
Date: Thu, 20 Feb 2020 17:51:08 -0800
Subject: [PATCH] Disable Azure Application Insights if a Do Not Track request
 is sent

---
 _layouts/default.html | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)
diff --git a/_layouts/default.html b/_layouts/default.html
index 3f00c79..0820762 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -25,15 +25,43 @@
 
     <!-- Azure Application Insights -->
     <script type='text/javascript'>
+        // Enables app insights IF AND ONLY IF user does not send a DNT request
+        // Shamelessly stolen from https://dev.to/spekulatius1984/how-to-check-do-not-track-dnt-in-javascript-57g1
+        let dntActive = () => {
+        // get the value from the various browser implementations.
+        let dnt_active = parseInt(
+            // Internet Explorer 9 and 10 vendor prefix
+            navigator.msDoNotTrack ||
+
+            // IE 11 uses window.doNotTrack
+            window.doNotTrack ||
+
+            // W3C
+            navigator.doNotTrack,
+            10
+        );
+
+        // If this comes to exactly 1 DNT is set.
+        return (dnt_active === 1);
+        }
+
+        // Check if DNT is active.
+        if (dntActive()) {
+        // active
+        console.log("Azure Application Insights has been disabled due to user's Do Not Track request")
+        } else {
+        // inactive
+        console.log("Azure Application Insights is active")
         var appInsights = window.appInsights || function (config) {
-            function r(config) { t[config] = function () { var i = arguments; t.queue.push(function () { t[config].apply(t, i) }) } }
-            var t = { config: config }, u = document, e = window, o = 'script', s = u.createElement(o), i, f; for (s.src = config.url || '//az416426.vo.msecnd.net/scripts/a/ai.0.js', u.getElementsByTagName(o)[0].parentNode.appendChild(s), t.cookie = u.cookie, t.queue = [], i = ['Event', 'Exception', 'Metric', 'PageView', 'Trace', 'Ajax']; i.length;)r('track' + i.pop()); return r('setAuthenticatedUserContext'), r('clearAuthenticatedUserContext'), config.disableExceptionTracking || (i = 'onerror', r('_' + i), f = e[i], e[i] = function (config, r, u, e, o) { var s = f && f(config, r, u, e, o); return s !== !0 && t['_' + i](config, r, u, e, o), s }), t
+        function r(config) { t[config] = function () { var i = arguments; t.queue.push(function () { t[config].apply(t, i) }) } }
+        var t = { config: config }, u = document, e = window, o = 'script', s = u.createElement(o), i, f; for (s.src = config.url || '//az416426.vo.msecnd.net/scripts/a/ai.0.js', u.getElementsByTagName(o)[0].parentNode.appendChild(s), t.cookie = u.cookie, t.queue = [], i = ['Event', 'Exception', 'Metric', 'PageView', 'Trace', 'Ajax']; i.length;)r('track' + i.pop()); return r('setAuthenticatedUserContext'), r('clearAuthenticatedUserContext'), config.disableExceptionTracking || (i = 'onerror', r('_' + i), f = e[i], e[i] = function (config, r, u, e, o) { var s = f && f(config, r, u, e, o); return s !== !0 && t['_' + i](config, r, u, e, o), s }), t
         }({
             instrumentationKey: '6a3cb8a6-9523-4f84-8237-915370d025ef'
         });
 
         window.appInsights = appInsights;
         appInsights.trackPageView(null, null, { urlReferrer: document.referrer });
+        }
     </script>
 </head>
 <body>
